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Long exposure problem

blubdog

Hurricane, US
255 posts

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blubdog Silver Member Nikonian since 29th Sep 2008
Thu 06-Dec-12 08:00 PM | edited Thu 06-Dec-12 08:09 PM by blubdog

I had a problem with some long exposure photos of a beach in sunlight. The overall exposure is fine, but the clear sky turned out very uneven, from very dark blue to almost white.

D700, 16-35mm, ISO 100 (low-1), F/22, 8 seconds. Singh-Ray Var-ND-Duo set to block 8 stops.

Any idea what caused this? I have a whole bunch of photos from the same shoot with the same problem, so the problem is consistent.

I'm guessing it may be the Var-ND-Duo and the way it's mechanism variably blocks light, but before I go spending money on one of their new 10-stop filters, I'd like to be sure.

Thanks!!!

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Attachment#1 (jpg file)

dagoldst

Little Rock, US
3093 posts

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#1. "RE: Long exposure problem" | In response to Reply # 0

dagoldst Gold Member Nikonian since 02nd Dec 2012
Thu 06-Dec-12 07:24 PM

While a lot of trouble at this point, it looks like a lens filter is the issue. I'd try reshooting without any filter on the lens.

I have seen this sort of thing on wide angles and polarizing filters.

David

"Extraordinary claims require extraordinary proof " - Carl Sagan

blubdog

Hurricane, US
255 posts

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#2. "RE: Long exposure problem" | In response to Reply # 1

blubdog Silver Member Nikonian since 29th Sep 2008
Thu 06-Dec-12 09:26 PM

>While a lot of trouble at this point, it looks like a lens
>filter is the issue. I'd try reshooting without any filter on
>the lens.

The lens works great otherwise. I have shots of the same coastline without any filters (but different exposure settings obviously) which all look fine.

>I have seen this sort of thing on wide angles and polarizing
>filters.

Then perhaps it's the polarizing part of the vari-nd-DUO? Maybe a regular Vari-ND would work better?

Thanks!

P.S. Is the correct forum for this question? Maybe the Landscape forum would be better? Wasn't really sure where to post...

Pete Wilson

Lake Orion, US
890 posts

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#3. "RE: Long exposure problem" | In response to Reply # 2

Pete Wilson Gold Member Winner in the Annual Nikonians Best Images Contest 2015 Nikonian since 27th Jun 2004
Thu 06-Dec-12 09:57 PM | edited Thu 06-Dec-12 09:58 PM by Pete Wilson

Your problem is with the polarization part of the filter. Polarizers don't work well on wide angle lenses when the sky is in the shot. Polarizers have the strongest effect when 90 degrees to the sun, if you point the camera directly towards the sun or 180 degrees from the sun (sun at your back) then the polarization effect is basically zero. Wide angle lenses can allow large areas of the sky to be in the photo so this effect looks just like what you see in your photo.

Pete Wilson
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JosephK

Seattle, WA, US
7108 posts

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#4. "RE: Long exposure problem" | In response to Reply # 0

JosephK Silver Member Fellow Ribbon awarded for his excellent and frequent contributions and sharing his in-depth knowledge and experience with the community in the Nikonians spirit. Nikonian since 17th Apr 2006
Thu 06-Dec-12 11:37 PM

Looks like David and Pete have you covered. What you are seeing is very common with wide-angle lenses when using polarizing filters.

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Joseph K
Seattle, WA, USA

D700, D200, D70S, 24-70mm f/2.8, VR 70-200mm f/2.8 II,
50mm f/1.4 D, 70-300mm f/4.5-5.6 VR, 18-70mm f/3.5-4.5 DX

blubdog

Hurricane, US
255 posts

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#5. "RE: Long exposure problem" | In response to Reply # 4

blubdog Silver Member Nikonian since 29th Sep 2008
Thu 06-Dec-12 11:55 PM

Makes sense now. Thanks everyone!

G